Pyrimidinyl phosphoric and thiophosphoric acid esters

ABSTRACT

WHEREIN R5 is hydrogen or alkyl of 1 to 5 carbon atoms. The compounds possess insecticidal activity. WHEREIN R1, R2, R3 and R4 are inter alia each alkyl, Q and Y are each oxygen or sulphur and Z is oxygen or   The present invention concerns novel pyrimidinyl phosphoric and thiophosphoric acid esters of the formula:

United States Patent 1 Milzner et al.

[ 1 Jan. 21, 1975 PYRIMIDINYL PHOSPIIORIC AND TIIIOPHOSPI-IORIC ACID ESTERS [75] Inventors: Karlheinz Milzner, Basel; Fritz Reisser, Therwil, both of Switzerland [73] Assignee: Sandoz Ltd. (a/k/a Sandoz AG),

Basel, Switzerland [22] Filed: Feb. 28, 1972 [21] Appl. No.: 230,043

[30] Foreign Application Priority Data Mar. 4, 1971 Switzerland 3190/71 Jan. 12, 1972 Switzerland 429/72 Aug. 20, 1971 Switzerland 12298/71 Jan. 12, 1972 Switzerland 430/72 [52] US. CL... 260/251 P, 260/251 R, 260/256.4 E,

260/256.4 R, 260/256.5 R, 424/200 [51] Int. Cl. C07d 51/36, C07d 51/40 [58] Field of Search 260/251 P Primary Examiner-Donald G. Daus Assistant E.\'aminerRalph D. McCloud Attorney, Agent. or FirmGcrald D. Sharkin; Richard E. Vila [57] ABSTRACT The present invention concerns novel pyrimidinyl phosphoric and thiophosphoric acid esters of the formula:

wherein R R R and R are inter alia each alkyl, 0 and Y are each oxygen or sulphur and Z is oxygen or wherein R is hydrogen or alkyl of l to 5 carbon atoms.

The compounds possess insecticidal activity.

11 Claims, No Drawings PYRIMIDINYL PHOSPI-IORIC AND THIOPIIOSPIIORIC ACID ESTERS IMPROVEMENTS IN OR RELATING TO ORGANIC wherein R,, R and R which may be the same or different, are

each alkyl or one to five carbon atoms R is alkyl of one to six carbon atoms, cycloalkyl of three to eight carbon atoms, phenyl or phenyl substituted by at least one of chlorine, bromine and alkyl of one to three carbon atoms, and Y which may be the same or different, are each oxygen or sulphur and Z is oxygen or 'wherein R is hydrogen or alkyl of one to five carbon atoms.

The present invention also provides a process for the production of a compound of formula I which comprises reacting a compound of formula II,

I II

wherein R R and Y are as defined above and M is hydrogen or a suitable cation, preferably hydrogen or an alkali metal or ammonium cation, with a compound of formula III,

on x-ik l III wherein R R Z and Q are as defined above and X is chlorine or bromine.

The process may, for example, be effected as follows VIZ.

The reaction may be effected in a suitable solvent e.g., an ester such as ethyl acetate, an amide such as dimethylformamide, an aromatic hydrocarbon such as toluene or xylene, a halogenated hydrocarbon such aschlorobenzene or chloroform, an ether such as dioxane or tetrahydrofuran, or a nitrile such as acetonitrile. The reactants are mixed at a temperature between 0 and 120C preferably at room temperature. In the case where M of formula II is hydrogen, an acid acceptor such as triethylamine or potassium carbonate may conveniently be employed. Preferably however M of formula II is sodium and the compound of formula II is employed immediately after the preparation thereof. It is preferably employed in dimethylformamide as solvent. Preferably also, X of formula III is chlorine and the compound of formula III is preferably employed in toluene as solvent. The reaction mixture may be stirred for between I and 6 hours, conveniently at an elevated temperature e.g., between 40 and C. After the reaction, the reaction mixture may be allowed to stand before working up. Working up may be effected in conventional manner.

The compounds of formula I are obtained as colourless oils or crystalline compounds which may be characterised by melting point or Rf-value as appropriate. They are soluble in organic solvents and generally readily emulsified in water.

The compounds of formula II employed as starting material in the production of compounds of formula I, may be produced by reacting a compound of formula IV,

I IV R cl wherein R is as defined above, with a compound of formula V,

Me-Y-R v wherein R and Y are as defined above and Me is sodium or potassium, and when required converting the resulting compound into a salt.

The compounds of formulae III and IV are described in the literature.

The compounds of formula I are useful because they possess biocidal activity. In particular, the compounds are useful as insecticides as indicated by the following tests viz.

Test (i) Effect against Carausius morosus (Indian rod locust) feed effect Tradescantia branches are immersed for 3 seconds in an emulsion containing 0.0125 percent of a compound of formula I. After drying the coating, each of the Tradescantia branches is inserted into a small glass tube filled with water which is placed in a glass dish. 10 Carausius larvae in the second stage are placed in the glass dish which is then closed with a wire mesh lid. After 5 days the rate of mortality is determined as a percentage by counting out the live and dead insects. Test (ii) Effect against Ephestia kuehniella moth) contact effect Petri dishes with a diameter of 7 cm, each containing 10 caterpillars having a length of 10 to 12 mm, are coated by spraying with 0.1 to 0.2 cc of an emulsion containing 0.05 percent of a compound of formula I. The dishes are then covered with a fine mesh brass wire grid. After drying the coating, a wafer is given as food and renewed as required. After 5 days the rate of mortality is determined as a percentage by counting out the live and dead insects.

Test (iii) Effect against Aphisfubae (black bean aphid) contact effect Broad bean plants (Vicia faba) are sprayed to run off with a spraying liquor containing 0.0125 percent of a compound of formula I. The broad bean plants are strongly infected with all the forms of development of the black bean aphid (Aphis fabae). After 2 days the rate of mortality is determined.

Test (iv) Effect against Panagrellus redivivus (paste nematode) 1 cc of an aqueous suspension of Panagrellus redivivus, containing about 120 insects, is placed in a small cup having a diameter of 5.5 cm and a height of 3.2 cm, and which contains 7 g of Terralite. 1 cc of an emulsion containing a compound of formula I is spread over the Terralite. After 48 hours the content of the cup is examined in accordance with the extraction method of Baermann (G. Baermann Meded. Geneesk, Lab. Weltevreden 41-47, 1917), and the live nematodes are counted out under a binocular magnifying glass.

It is to be understood that the term insect as used herein is used in a broad sense and may include classes of animal organism related or similar to the class Insecta such as Nematoda. The term insecticide and insecticidal as used herein should be construed accordingly.

For the abovementioned use the amount of the compound to be applied will vary depending on the particular compound employed, the mode of application, ambient conditions and the effect desired. With regard to plant protection, in general a satisfactory amount to be applied to a plant locus is between 4 and 10 kg/hectare.

The compounds may be used in animal buildings e.g., stables, inhabited rooms e.g., collars and attics, as well as in plant loci.

The compounds may be employed as a composition with insecticidal carriers and diluents in solid or liquid form e.g., spraying and dusting powders, strewing granulates, spraying liquids and aerosols.

Solid forms may include carriers such as diatomaceous earth, talc, caolitc, attapulgite, pyrophyllite, artificial mineral fillers based on SiO and silicates, lime, decahydrate and plant material carriers such as walnut and flour. Adjuvants such as wetting and dispersing agents. e.g., sodium-laurylsulphate, sodium-dodecyl benzenesulphate, condensation products from naphthalene sulphonate and formaldehyde, polyglycol ether and lignin derivatives such as sulphite liquor, may also be included in the case of wettable powders to be applied as a water suspension. Granulates are produced by coating or impregnating granular carrier materials such as pumice, limestone, attapulgite and coalite with the compounds.

Liquid forms may include non-phytotoxic diluents such as alcohols, glycols, glycolic ethers, aliphatic and aromatic hydrocarbons e.g., xylene, alkyl naphthalenes and other petroleum distillates, and ketones e.g., cyclohexanone and isophoxone. Adjuvants such as surface active agents, e.g., wetting and emulsifying agents such as polyglycol ether formed by the reaction of an alkylene oxide with high molecular weight alcohols, mercaptans or alkyl phenols, and/or alkyl benzene sulphonates, may be included in emulsion concentrate forms.

Aside from the abovementioned carriers, diluents and adjuvents already mentioned, adjuvants such as stabilizing agents, desactivators (for solid forms with carriers having an active surface), agents for improving adhesiveness to surface treated, anticorrosives, defoaming agents and pigments may also be included.

Concentrate forms of composition generally contain between 1 and percent preferably between 5 and 50 percent by weight of active compound.

Application forms of composition generally contain between 0.02 and 90 percent, preferably between 0.1 and 20 percent by weight of active compound.

Examples of concentrate and application forms of composition will now be described:

a. Emulsifiable concentrate 25 parts by weight of a compound of formula I are mixed with 20 parts by weights of isooctylphenyldecaglycol ether, 5 parts by weight of the calcium salt of an alkyl aryl sulphonate and 50 parts by weight of xylene whereby a clear solution is obtained which may be readily emulsified in water. The concentrate is diluted with water to the desired concentration for use.

b. Emulsifiable concentrate 25 parts by weight of a compound of formula I are mixed with 25 parts by weight of isooctylphenyloctaglycol ether, 5 parts by weight of the calcium salt of an alkyl aryl sulphonate and 45 parts by weight of an aromatic petroleum fraction having a boiling point of 210 to 280 (D 0.92). The concentrate is diluted with water to the desired concentration for use.

0. Spraying and dusting powder application form 25 parts by weight of a compound of formula I, 2

parts by weight of lauryl sulphate, 3 parts by weight of sodium lignine sulphonate are mixed with 70 parts by weight of diatomaceous earth and ground until the grains have obtained a size of 10 p. as an average The preferred compounds of formula I are those wherein Y is oxygen, particularly those wherein Y is oxygen, 0 is sulphur and Z is oxygen and those wherein Y is oxygen, 0 is oxygen and Z is The production of compounds of the invention will now be described by way of Example. Temperatures are indicated in degrees Centigrade.

EXAMPLE 1 0,0-Dimethyl-0-(2-methyl-4-methoxy-pyrimidinyl- 6)-thionophosphate 4.8 g (0.1 mol) of sodium hydride (50 percent in mineral oil) are added while stirring vigorously and in the absence of moisture to 14 g (0.1 mol) of 2-methyl- 4-methoxy-6-hydroxypyrimidine in 300 cc of absolute dimethylformamide. After stirring the mixture at room temperature for about half an hour solids are rapidly removed by suction and 16 g (0.1 mol) of 0,0-dimethylthionophosphoric acid chloride in cc of absolute toluene are added dropwise and while stirring to the filtrate. The mixture is stirred at 45 for a further 5 hours and is allowed to stand over night at room temperature. The solvent is decanted as far as possible in a vaacuum/high vacuum and the residue is taken up in ether and the etheral solution is concentrated by evaporation. The compound crystallizes in the form of colourless crystals having a M.P. of 66-67. The degree of purity is examined on a silica gel thin layer plate with fluorescence indicator using ether as eluant. Rf-value 0.75. Chromatographical purification of the substance may be effected on a silica gel column with ether as eluant.

up in chloroform, is washed four times with 100 cc amounts of 1 N solution of sodium hydroxide and subsequently four times with 100 cc amounts ofwater l1av ing a temperature of 8. The chloroform phase is dried Analysis: C H, N O PS Molecular weight: 264.24

Calc. c 36.4% 11 5.07. N 10.6% P 11.7% 512.1% Found 36.8% 5.1% 10.77, 11.7% 12.1%

EXAMPLE 2 0,0-Dimethyl-O-(2-methyl-4-ethoxy-pyrimidinyl-6)- thionophosphate 4.8 g (0.1 mol) of sodium hydride (50 percent in mineral oil) are added while stirring vigorously and in the absence of moisture to 15.4 g (0.1 mol) of 2-methyl-4-ethoxypyrimidine in 300 cc of absolute diwith sodium sulphate and optionally treated with animal charcoal. After filtration it is concentrated in a vacuum by evaporation. The compound is obtained in 5 the form of an almost colourless oil. The degree of purity is examined on a silica gel thin layer plate with fluorescence indicator using ether as eluant. Rf-value 0.52. Chromatographical purification of the substance may be effected on a silica gel column with ether as elumethylformamide. After stirring the mixture at room 20 Analysis: C,H. N O1 Calc. 3

Found Molecular weight: 278.3

temperature for about half an hour solids are rapidly removed by suction and 16 g (0.1 mol) of 0,0-dimethylthionophosphoric acid chloride in 100 cc In an analogous manner to that described in Examples 1 and 2 the following compounds may be produced viz.

of absolute toluene are added dropwise and while stirring to the filtrate. The mixture is stirred at 45 for a further 5 hours and is allowed to stand over night at room temperature. The solvent is decanted as far as possible in a vacuum/high vacuum. The residue is taken In the following Examples 3 to 51 the process for the production of compounds of formula 1 is analogous to that describied in Examples 1 and 2. The compounds are obtained as slightly coloured or colourless oils. In Examples 3 to 51 Q is sulphur and Z is oxygen.

Mole- Analysis Cale.

Example R R R R. Y Empirical cular Rf- Found No. formula weight value* C H N P S 3 CH CH LC H (H 0 C IH N OJ S 292.3 0.56 41.1 5.9 9.6 10.6 11.0

4 CH (H (H NLQH O H N OJS 306.3 0.61 43.1 6.3 9.1 10.1 10.5

s ('11.. ('11 (.11. ("11. s- ('.,11. .N o.,1 s. 294.3 0.54 36.7 5.1 9.5 10.5 21.11

0 (1H,. -H -H H 0 H N OJS 306.3 0.60 43.1 (1.3 9.1 10.1 10.5

CHIC.

Found Analysis 7r Molecular Rfvalue* R. Y Empirical Example R formula weigh! .4 5130 4413 015583 122422 15189306 .4885535203319333139003 0U 0 luQdnoo oo oo o oogg009899009000 9 00099000099009 099888700 1 11 11 11 11111 11 11 22 111111 11 22 11111111 112 9 .1 1 14 .0 6313134273070419337868194112J0001133JB0104J 89000000901.Q40188898889998889988998800000070000900007800998888998988998888888700009 2 31 .1 Q x5450 3 20371100831003703 185703] 4444444444 4444 4444 4444 444 44444444443444444444444444443444444444443 8 6 0 9 5 5 7 9 8 7 9 5 7 6 2 2 5 5 6 9 4 l l 3 0 7 O 6 9 7 5 2 9 4 O 0 0 0 O O 0 0 0 0 0 0 0 0 0 O 0 0 0 0 0 0 O 0 O 0 0 0 O 0 0 0 0 0 3 3 4 3 4 3 4 3 4 3 4 4 4 3 4 4 4 3 a 0 2 Al 6 4 6 4 6 8 6 2 0 6 4 0 8 8 8 6 2 2 0 4 6 0 8 8 6 2 0 0 O 4 9 7- 9 9 0 3 O 3 0 0 3 9 2 0 3 2 4 4 O 1 2 9 2 3 0 2 4 0 3 2 5 5 2 9 2 3 2 -I- W41 3 3 3 3 3 3 2 3 3 3 3 3 3 1 1 3 2 3 3 3 3 3 3 3 3 3 3 3 2 S S S H S S S S S S S S S S S S S QM QM S S S S N S QM Q Q S S 2 P P P 4 D1 D! P D: P P P D- P P P P P D! P P P P P P 4 P p P D: P P P m 4 4 4 0 4 4 4 4 4 1. 1 4 4 4 4 4 4 4 1 1. 1 4 4 4 4 0 4 1 1. 1 1 1. 4 1 O 0 O 2 O O O O O O O O O O O O O O O O O O O O O 1. O O O O O O O O 1. 1. 1 1. 1 1. 1. 1. 1. .1. 1. 1 1. .1 .1. .1 1. 1 1. 1. 1. .1 1. N 1. 1. 1 1 1. 1. .1 1. N N N N N N N N N N N N N N N N N N N N N N N N N 1 N N N N N N N N n H H H m n m n m n m H .H m u u n H H H m 1 H n H m u n H m u n u 1. H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H m 1 w m H m H m 1 w n w 1 H 1 u H H w n H m H n u u u w u H m m m 1. C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C O O O O O O O O O S S O O O O O O O S S S O O O O O O S S S S S O S 7 7 7 7 7 7 7 7 7 7 m m Um m m H7 m m m m 7 1 1 1 1. 1. 1 1 1. 1. 1 H H H H "m H H 1 M H 1. 1 1 1 1 1. 1 1 1. 1 H 1 1 H H H 1. m. 1. m. m. m. O O C C C L L L C C G m. H C C C C C C C C C C C 1 1 1 1 .1 1 1 1 1 1 n n n n n n n n n n 1 C C Um: m m NW1 7 7 m m H7 7 7 3 5 3 1 H H z 5 1 H 5 S 1 11. 7 .1 S a 5 5 H H 5 5 5 5 5 HM o c. 1 6. c Q H 1. 1. H H c c. G H H m H um 1 "m. 0 a m H 1 1 1 "m. "m C 1 n C n n .1 1 C C C C C C C n n 1 1. C C C C 1 1 C C C C C C C H um 11 1. 1. H 1 um H 1 H 1 "m 1 H 1 H H 1 H 1 1 H H 1. 1 H .1. um 1. H H 1. 1 1. 1. H H H H 1. 1. H 1. H 1. H H 1. 1. H 1. H H 1. 1 H H 1. H H 1. 1. 1. H C C C C C C C c C C C C C C C C C C t C C C C C C C C C C C C C um H 1. 1 1. "m 1 H um 1 um 1 "m 1. "m 1 "m "m 1 H 1 1 H "m 1. 1 "m 1 H 1 H 11 1. 1. 1. 1. H H H 1 H .1 1. H 1. H 1. H 1. H 1. 1. H 1. H H 1. 1. H H 1 H .1 H 1. m. m. H C C C C C C L C C C C C C C C C C C C r. C C C C C C C C C C C C C C 7 8 9 0 4| 2 3 4 5 6 7 8 9 0 l 2 3 4 S 6 7 8 9 0 l 2 3 4 5 6 7 8 9 0 l l I I l I 1 l l 2 2 2 2 2 2 2 2 2 2 3 3 3 3 3 3 3 3 3 3 4 504 .041519133 L .).0.1711\.O. 099999 022 2 WWH IIWWWWI 111 6060 .40549701 iifiii675667677755554555 6.0902090908093919313073 7 9umi5 55558799894567 1 447 44444444444433331 7 L. f I 20620 6%Hfiflfi54677 00000000000 20002000000004 1! 9 nunnnnmumnz w H S 22 m M m m m 1 m D m m m 3.1.434 4 433 4 1 .1 1 w 1 w wnwnwnw 1 1 1 1 1 1 1 1NNN 111.111.11 HH HHH HHHH C C CCCCCCCCC 00000 H um H 5 H H H 1 0 m H. H1 H ((CCLnnCCCC 1 111 1mm m a mus 1.H H .CsHH ((n C1nnCCCC 11 m1111 HJ 1 mHH1HHHH ((CCCCCCCCC 3 41 11 m m m mHH"mHHHH C(LCCCCCCCC 1 1. 4 4 4 4 44 4uwwm4ss on xilicu gel thin layer plates with other as cluun! on silica gel lhin luycr plums wilh humane/ether (6:4) as cluunl.

EXAMPLE 52 0,()-Diethyl--(2-methyl-4-methoxy-pyrimidinyl-6)- phosphate 7.2 g (0.15 mol) of sodium hydride (50 percent in mineral oil) are added while stirring vigorously and in the absence of moisture to 21 g (0.15 mol) of 2-methy1- 4-methoxy-6-hydroxypyrimidine in 400 cc of absolute dimethylformamide. After stirring the mixture at room temperature for about half an hour solids are rapidly removed by suction and 25.8 g (0.15 mol) of diethyl- Molecular weight, 277.3

Cale. C39.0% H5.8%- N15.2% P1109? 511.2%

Found 387% 5.9% 15.1% 11.5% 11.2%

phosphoric acid chloride in 100 cc of absolute toluene EXAMPLE 54 are added dropwise during the course of about 30 minutes and while stirring to the filtrate. The mixture is stirred at room temperature for about 4% further hours, is removed by suction and the filtrate is set free from the solvent in a vacuum/high vacuum. The residue is digested three times with 200 cc amounts of ether and the etheral solution is evaporated in a vacuum. The crude product may as far as possible be purified immediately afterwards on a silica gel column with ether as eluant. The substance is obtained in the form of a colourless oil. The degree of purity is examined on silica gel thin layer plates with fluorescence indicator and ether as eluant. Rf-value 0.23.

methoxypyrimidiny1-6)-thionophosphoroamidate 20.0 g (0.145 mol) of K CO are added to a solution of 15.4 g (0.1 mol) of 2-ethyl-4-methoxy-6-hydroxypyrimidine in 250 cc of acetic acid and 16.0 g (0.1 mol) of O-methyl-N-methyl-thiophosphoroamidochloridate are subsequently added at room temperature within 5 0-Methyl-N-methyl-0-(2-isopropyl-4- methoxypyrimidinyl-6)-phosphoroamidate A solution of 14.35 g (0.1 mol) of O-methyl-N- methyl-phosphoroamidochloridate in 300 cc of toluene is added dropwise within 15 minutes to a solution of 19.0 g (0.1 mol) of the sodium salt of 2-isopropyl-4- methoxy--hydroxy-pyrimidine in 100 cc of absolute toluene; the reaction mixture is stirred at room temperature for one further hour and is subsequently heated to 50 for 8 hours. The reaction mixture is then cooled, washed three times with 200 cc amounts of water until the pH value of the washings is 7, the toluene phase is dried over Na SO and the toluene is decanted at a rotatory evaporator. The 0-methyl-N-methy1-0-(2- isopropyl-4-methoxy-pyrimidinyl-6)- phosphoroamidate is obtained as yellow oil.

Analysis: Cm m J l 616. C 43.6 "/1, Found Molecular weight: 275.2 H 6.6 N 15.3

Pll.3%

R R2 R; R4 0 Y Empirical formula Analysis Cale. Exple. Molecular weight Found M.P. No. C H N S P 1C] CH, CH CH3 C,H s s c,,H.,r-1,o 1 s 36.9 5.5 14.3 21.9 10.6 61-63 293.3 36.6 5.4 14.4 21.7 10.8 56 CH, CH C2H5 C H, s s C,.,H,,.1-1,o.1 s 39.1 5.9 13.7 20.9 10.1 39.5-40

. 307.4 39.3 5.7 13.9 20.6 10.3 57 CH CH CH 1C3H1 o s C..,H.,N,o,1 s 41.2 6.2 14.4 11.0 10.6 611 291.3 41.5 6.4 14.5 10.8 10.8 CH C H 10 H 0 s C H N 0 PS 433 6.6 13.8 10.5 10.1 Oil 58 CH3 3 1 5 3 1 3 05. 3 3 43.6 6.7 13.13 10.5 9.13 59 CH CH CH C H o s C,H,,N o,1 s 39.0 5.13 15.2 11.6 11.2 611 277.3 39.0 5.7 15.0 11.9 10.0 611 60 CH CH C H C H o s C H N 0 1 3 41.2 6.2 14.4 11.0 10.6 Oil 3 a 2 5 2 a w 231. 3 41.4 6.2 14.6 113 10.3 61 CHa C,H, CH C2H5 o 0 C,,H,,N,0.P 43.6 6.6 15.3 11.3 41-45 275.2 43.9 6.8 15.0 10.0 H CH CH 0 o c H N OP 43.6 6.6 15.3 11.3 53 62 C a J 2 5 27 5.2 43.8 6.9 15.1 11.0 C H CH C H o o C H N o P 45.7 7.0 14.5 10.7 Oll 63 2 5 a 2 5 "2093 4 46.0 7.1 14.7 10.7

In analogou mfinnfir as described in Examples 53 warm solution of 9.2 g of metallic sodium in 140 cc of and 54 the followmg Compounds of general formula I absolute ethanol. When a clear solution is obtained it were prod is transferred into a heatable autoclave. After heating the solution to 130 for 96 hours in the autoclave it is EXAMPLE 104 cooled down and the solvent is evaporated. The residue 0 M h N di th 1 Q (2 thy] 4 eth y is dissolved in about 200 cc of water. Then the pH i i p hi h h id t value is adjusted to 6 with glacial acetic acid and while Slightly yellow oil. stirring vigorously. Cooling to about 4 is effected and Analysis: C H N o PS Molecular weight: 305.3

CalC. C43.3% 116.692 N 13.8% 510.5% P101 "/1 Found 436 72 6.7 92 13.5 71 10.8 92 9.8 "4

EXAMPLE 105 after about 10 minutes the obtained crystals which may be washed with a small amount of icewater are filtered off. The colourless needle shaped crystals may be recrystallized from water. M.P. l93-194.

0-Methyl-N-dimethyl-0-( 2-ethyl-4-ethoxypyrimidinyl-6 )-phosphoroamidate Oil.

Analysis: C H N Q P Molecular weight: 289.3

Analys1s: C-,H N202 Molecular wetght: 154.2 C 22 N 3 CalC. c 54.5 11 6.5 N 18.2 Found 54.7 6.5 18.2

STARTING MATERIALS In analogous manner as described for 2-methyl-4- The production of the starting compounds of formula elhoxy'6'hydroxypyrlmldme p the ll may be effected in accordance with the following 1511- lOWlng compounds of general formula II may be proamples: duced.

Calc.

Example R;, R4 Y Empirical Molecular Analysis Found M.P. No. formula weight C H N [T] 107 n.C H CH 0 C tl N o 168.2 57.1 7.2 16.7 140 141 57.6 7.5 16.5 108 i.C;,H CH 0 0 11 19 0 168.2 57.1 7.2 16.7 158 159 56.9 7.1 16.5 109 11.61.11, C 11 0 C H N O l82.2 59.3 7.7 15.4 99

59.3 7.6 15.4 110 10 11, c 14 0 C H MO2 182.2 59.3 7.7 15.4 79- 80 59.2 7.7 15.6 111 CH '1.C3H, 0 CHHHNZOZ 168.2 57.1 7.2 16.7 143-144 56.9 7.1 16.5 112 11 11: 11. 0 C H N O 182.2 59.3 7.7 15.4 137-138 59.4 7.8 15.4 113 n.C;,H i.C H, O C H N O 196.2 61.2 8.2 14.3 118 119 61.1 8.3 143 114 i.C H, LC H 0 C H N O 196.2 61.2 8.2 14.3 I36- 137 61.1 8.3 14.2 115 CH1. n.C H 0 CDHHNQOQ 182.2 59.3 7.7 15.4 81 82 59.9 7.9 15.3 116 0,11 C2H o C,,H. N o 168.2 57.1 7.2 16.7 123 124 57.4 7.1 16.4 117 CH;, 11.63.11, 0 C1.H.,N,0., 168.2 57.1 7.2 16.7 98-100 569 7.2 16.8 118 6.6311. n.C:,H 0 0, 11,494). 196.2 61.2 8.2 14.3 89 90 61.1 8.3 14.2 119 11 n.(.';,H-, 0 (2,,H, 1 1,o 182.2 59.3 7.7 15.4 94 -95 59.3 7.8 15.3 120 il H, 6.63.11 0 c u N o 196.2 61.2 8.2 14.3 84-86 61.3 8.4 14.0 121 (5H. c 11,, 0 C H N O 216.2 66.7 5.6 13.0 158 159 66.2 5.6 12.7 122 CH3 CH 0 CGHHN2OQ 140.14 51.4 5.8 20.0 249 -251 51.0 5.7 19.9 123 C11 c 11 0 C111 1-1 o 154.17 54.5 6.5 18.2 139-140 EXAMPLE 106 65 EX 124 2-Methyl-4-ethoxy-6-hydroxypyrimidin 2-lsopropyl-4-methylthio-o-hydroxypyrimidine 2 -3 g of hy g (3.4 mols) of methyl mercaptan are introduced hydroxypirimidine are added while Stirring t 8 Still during the course of 30 minutes into a clear solution of 76 g of sodium metal in 1500 cc of methanol; the solution is kept at by cooling with ice. The mixture is stirred for about half an hour with cooling and the excess of methyl mercaptan is decanted at the rotatory evaporator. In a pressure autoclave there are added 258 g (1.5 mol) of 2-isopropyl-4-chloro-6- hydroxypyrimidine with 100 cc of methanol to the methanolic solution of the sodium thiomethylate. The well closed autoclave is subsequently heated to 100 for 24 hours, is cooled to room temperature and the solvent is decanted in a vacuum. The residue is dissolved in 300 cc of water and precipitated by adding glacial acetic acid. Removal by suction is subsequently effected at 5. It is recrystallized from alcohol/water (6:4) and dried at 80 in a vacuum. Colourless crystals having a M.P. of 205206 are obtained.

Molecular weight: 184.2

In analogous manner as described for 2-isopropy1-4- methylthio-6-hydroxypirimidine (Example 124) the following compounds of general formula II may also be 16 wherein R and R which are the same, are methyl or ethyl,

R is methyl, ethyl, n-propyl or isopropyl,

R is methyl, ethyl, n-propyl. isopropy or n-butyl. and

Y is oxygen or sulfur.

2. A compound of claim 1 in which Y is oxygen.

3. The compound of claim 1 which is 0.0-diethyl-O- (2-isopropyl-4-methoxy-pyrimidinyl-6)- thionophosphate.

4. The compound of claim 1, which is 0,0-dimethy|' 0-(2-ethy1-4-methoxy-pyrimidiny1-6)-thionophosphate.

5. The compound of claim 1, which is 0,0-dimethy1- O-(2-ethy1-4-ethoxy-pyrimidinyl6)-thionophosphate.

6. The compound of claim 1, which is 0,0-dimethyl- O-(2-methyl-4-ethoxy-pyrimidiny1-6)-thionophosphate.

7. The compound of claim 1, which is 0,0-dimethy1- 0-(2-isopropyl-4-methoxy-pyrimidiny1-6)- thionophosphate.

8. The compound of claim 1, which is 0,0-dimethyl- 0-(2-n-propyl-4-ethoxy-pyrimidinyl-6)- thionophosphate.

9. The compound of claim 1, which is 0,0-dimethy1- 0-(2-n-propyl-4-methoxy-pyrimidinyl-6)- d d; thionophosphate.

Example C al r No. R; R. Y Empirical Molecular Analysis Found M.P. formula weight H S [C] 125 C H C H, S C H N OS 184.2 52.1 6.6 15.2 17.4 117 118 51.9 6.7 15.0 17.4 126 C 11; CH: 5 C l-l N OS 170.2 49.4 5.9 16.5 18.8 163 164 49.0 6.0 16.7 18.5 127 C H i.C H-, S C H N OS 198.3 54.5 7.1 14.1 16.2 158 159 54.5 7.1 14.1 16.4 128 CH; n.C;,H S C, H, N OS 184.2 52.1 6.6 15.2 17.4 164 165 52.1 6.6 15.2 17.4 129 C H n.C H-, S C H N OS 198.3 54.5 7.1 14.8 16.2 93 94 54.5 7.0 14.2 16.0 130 CH CH 5 C H N OS 156.2 46.1 5.2 17.9 20.2 226 227 46.3 5.3 17.6 20.1 131 CH: C 11 S C H N OS 170.2 49.4 5.9 16.5 18.8 160 161 What is claimed is: l. A compound of the formula:

S 0R 1| 1 op 2 N 1 k YR 

2. A compound of claim 1 in which Y is oxygen.
 3. The compound of claim 1 which is 0,0-diethyl-0-(2-isopropyl-4-methoxy-pyrimidinyl-6)-thionophosphate.
 4. The compound of claim 1, which is 0,0-dimethyl-0-(2-ethyl-4-methoxy-pyrimidinyl-6)-thionophosphate.
 5. The compound of claim 1, which is 0,0-dimethyl-0-(2-ethyl-4-ethoxy-pyrimidinyl-6)-thionophosphate.
 6. The compound of claim 1, which is 0,0-dimethyl-0-(2-methyl-4-ethoxy-pyrimidinyl-6)-thionophosphate.
 7. The compound of claim 1, which is 0,0-dimethyl-0-(2-isopropyl-4-methoxy-pyrimidinyl-6)-thionophosphate.
 8. The compound of claim 1, which is 0,0-dimethyl-0-(2-n-propyl-4-ethoxy-pyrimidinyl-6)-thionophosphate.
 9. The compound of claim 1, which is 0,0-dimethyl-0-(2-n-propyl-4-methoxy-pyrimidinyl-6)-thionophosphate.
 10. The compound of claim 1, which is 0,0-dimethyl-0-(2-isopropyl-4-ethoxy-pyrimidinyl-6)-thionophosphate.
 11. The compound of claim 1 which is 0,0-diethyl-0-(2-isopropyl-4-methylthio-pyrimidinyl-6)-thionophosphate. 